/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef NotificationPresenter_h
#define NotificationPresenter_h

#include <wtf/PassRefPtr.h>
#include "VoidCallback.h"

#if ENABLE(NOTIFICATIONS)

namespace WebCore {

    class Document;
    class Notification;
    class KURL;
    class ScriptExecutionContext;

    class NotificationPresenter {

    public:
        enum Permission {
            PermissionAllowed, // User has allowed notifications
            PermissionNotAllowed, // User has not yet allowed
            PermissionDenied // User has explicitly denied permission
        };

        virtual ~NotificationPresenter() {}

        // Requests that a notification be shown.
        virtual bool show(Notification*) = 0;

        // Requests that a notification that has already been shown be canceled.
        virtual void cancel(Notification*) = 0;

        // Informs the presenter that a Notification object has been destroyed
        // (such as by a page transition).  The presenter may continue showing
        // the notification, but must not attempt to call the event handlers.
        virtual void notificationObjectDestroyed(Notification*) = 0;

        // Requests user permission to show desktop notifications from a particular
        // script context. The callback parameter should be run when the user has
        // made a decision.
        virtual void requestPermission(ScriptExecutionContext*, PassRefPtr<VoidCallback>) = 0;

        // Cancel all outstanding requests for the ScriptExecutionContext
        virtual void cancelRequestsForPermission(ScriptExecutionContext*) = 0;

        // Checks the current level of permission.
        virtual Permission checkPermission(ScriptExecutionContext*) = 0;
    };

} // namespace WebCore

#endif // ENABLE(NOTIFICATIONS)

#endif // NotificationPresenter_h
